Pedal air-compressor



(No Model.)

J. NORTH. PEDAL AIR COMPRESSOR. 1

N0. 527,248. Patented Oct; 9, 1894.

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JOHN NORTH, OF TOLEDO, OHIO.

PEDAL AIR-COMPRESSOR.

SPECIFICATION forming part of Letters Patent No. 527,248, dated October 9, 1894.

Application filed November 27, 1893- $erial No. 492078. (No model.)

To a. whom it may concern.-

Be it known that I, JOHN NORTH, of Toledo, county of Lucas, and State of Ohio, have invented certain new and useful Improvements in Pedal Air-Compressors; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form part of this specification. H My invention relates to a pedal air compressor of that character designed to supply a continuous current. of air under pressure for use in spraying or atomizing medicaments, and for blow pipes and analogous uses.

The object of the invention is to provide a compressor of compact form that can be conveniently operated with the foot, and produce a continuous current of air to be conducted from the compressor through a pipe or tube to an atomizer or for other purposes.

The invention consists in the parts and combination of parts hereinafter described and pointed out in the claim.

In the drawings: Figure 1 is a perspective view of a complete apparatus, showing the tube for conveying the air to the point of use.

Fig. 2 is a longitudinal vertical sectional View, taken throughthe center of the apparatus. Fig. 3 is a sectional detail view showing the valve attachment to the compression bulbs. Fig. 4: is an elevation of a modified form of tube.

1 designates a base frame comprising the bottom plate 2, top plate 3, end standards 4, and central air reservoir 5, tapped upon either side at 6, and screw threaded to receive the screw-threaded end 7 of a compressible bulb 8, the top plate 3 having horizontally, co-incident screw-threaded holes 9 to receive the opposite screw-threaded end of the bulb, whereby two like bulbs may be secured in the frame, and receiving air alternately at their outer ends 10, discharge at their inner ends 11 into the air-reservoir 5.

Top plate 3 is formed with two elliptical chambers 23 into which the bulbs 8 rest with one half their circumferential portions with the upper half projecting above the horizontal plane of the plate,

Upon each outer side of the air reservoir 5 is an outwardly projecting stud 12, which studs project through elongated slots formed in the downwardly projecting side wings 13 of a pedal plate 14:, whereby the plate is allowed a pivotal movement with regard to the base frame.

Pedal plate l l is formed with hemispherical projections 15 co-incident with the center of the bulbs, whereby when the plate is rocked upon its pivots 12, the bulbs will be alternately compressed and (owing to the flexibility of their material) expanded. Each bulb 8 is provided with avalve chamber 16, in which is seated a valve 17, those upon the outer ends seating outwardly, and those upon the inner ends seating inwardly, so that when the pressure is put upon either bulb, the air contained therein will be forced into air reservoir 5, while the valve of the inner end of the opposite bulb will be seated, and the expansion of the bulb will draw in the air from the outer end filling the bulb, this alternate inhalation and exhalation continuing as the pedal plate is rocked.

Tapped into the air reservoir 5 is a nipple 18, upon which is secured a tube 19 which may be attached to an atomizer, blow pipe, or applied to any use wherein a constant current of air under pressure is desired.

In Fig. at is shown a modified form of tube 19, in which there is interposed an auxiliary air reservoir 20, preferably composed of soft rubber, and covered with a netting 21 to limit the extent of distortion of the chamber 20. The purpose of the auxiliary air reservoir is toprovide an additional reservoir to reservoir 5, which effectually provides against perceptible variations of the discharge at the end of the tube due to varying action in compressing the bulbs, this feature being only desirable for blow pipes, where an unvarying constant fiow is necessary.

The object of the elongation of the slots 13 is to allow the top plate to normally rise to a height to remove the projections 15 from contact with the bulbs to a degree to compress the same, and for this purpose there is one or more springs 22 interposed between the top of the air chamber and the plate, whereby when foot pressure is removed from plate 3, the plate will rise as described.

It will be seen that the apparatus is com pact, and the'entireoperation per-formedrby the pressure of the foot, leaving the hands free to manipulate the article acted upon by the air current.

What I claim is- In a pedal air compressor, a frame having a central air reservoir, compressible bulbs arranged at each endof the frame, a pedal plate arranged above the frame having end portions coincident with the bulbs and downwardly extending side flanges, vertical slots 7 in the flanges, pins upon the frame for enf enoeof two witnesses.

gagement with the slots, whereby when the plate is in operative position to alternately compress the bulbs, the pins are seated in the upper endsof the slots and the plate has a rocking motion, and when in a normal position the plate is raised above the bulbs.

In testimony that I claim the foregoing as my own I hereby aflix my signature in pres- JOHN NORTH. Witnesses:

PAUL JONES ENGELM-AN,

ERSKINE H. POTTER. 

